Antenna system



sept. 2o, 1932. T. R. BAKER 1,878,257

ANTENNA SYSTEM Filed June 25, 1929 2 Fla INVENTOR. WITNEssEs:

' @MAS EBAKER,

' HIS ATTORNEY.

Patented Sept. 20, 1932 THOMAS n. BAKER, or CHICAGO,

PATENT ori-*ICE ILLINOIS, ASSIGNOR F ONE-HALF TO JAMES E. BAKER, OFCHICAGO, ILLINOIS AN TENNA SYSTEM Application led June 26,

whilereducing static interference.

Additional objects and advantages of the method and constructionemployed will appear more fullyv in the hereinafter details when takeninconnection with the accompanying'y drawing, in which,

Fig. 1 is a perspective view of an antenna systemoperatively associatedkwith radlo receiving apparatus; y,

, Fig. 2 is an enlarged elevational view, with if'. parts broken away,of details employed in the construction of my antenna system;

Fig. 3 is an elevational view taken on line- 3-3 of Fig. 2;

Fig. 4 is an enlarged vertical sectional view, taken substantially-onthe line 4-#4 of Fig. 5, of angelement employed for obtainlng an.efficient ground connection for the an-A tenna; y t

Fig. 5 is a top plan view ofthe devlce s; shown in Fig. 4'; and

Fig. 6 is a diagrammatic view of the antenna circuit.

In the drawing wherein similar characters of reference indicatecorresponding parts in the preferred form of my invention, 11 and 12designate standards suitably braced by guy wires 13, 14. To thestandards 11 and 12 the boards 15, 16 are secured. As clearly shown inFig. 2 to each of the boards 15, 16, a plurality of screw eyes or othersuitable fastening elements 17 are secured. Con* nected at one end bythe wires 18 to the screw eyes 17 are insulators 19, the other ends ofwhich are inter-connected by longitudinally stretching antenna wires 20,the uppermost 21 of which, as shown in Figs. 1 and 2, is connected atthe right side thereof by a wire 22 which leads to and is connected witha metal ground engaging member 23, the latter having a threaded socketaccommodating 1929. Serial N0. 373,804.

binding screw 24, the base of the ground engaging member 23 beingprovided with a plurality of radially extending feet 25. be observedthat in the general disposition of the antenna wires 20, the insulators19, and the connecting wires 18 are secured to the boards 15, 16 insubstantially the same manner both `at the left and right hand sides ofthe antenna supporting structure. At the left hand side of the pluralityof wires 20, and secured to the uppermost 21 thereof, is a dependinglead-in wire 26, which latter is directly connectedto a radio receiving,set 27 which in the illustration is located in the interi c r of thestructurel A.

As best shown structurally in Figs. 1 and 2, and also in thediagrammatic View of Fig. 6, it will be seen that the. present antennasystem may be considered as being divided into 'two components, thefirst of which comprises the wire 22 leading from the ground to theuppermost wire 21 `and forming with the lead-in wire 26 to the radioreceiving set a static drain, the other component comprising theplurality of longitudinally stretching wires 20, six in all, which arearranged in two separate groups B and C as more clearly shown in thediagram in Fig. 6; the rirst of these groups B comprising the threewires 28, 29, 30; the other group C, including the wires 31, 32, 33.Group B is interconnected by the short leads 34, 35, whiler group C isinterconnected by the leads 36, 37. The groups of wires B and C, as moreclearly shown in Fig. 6 practically form ak condenser the capacity ofwhich will be a function of the distance between the. individual wiresof two groups of wires B and C and the surface area thereof. As shown inFigs. 1 and 2, both groups of wires B and C are connected to the lead-inwire 26 through the respective short leads 34, 35, and 36, 37, andthrough said lead-in wire 26 to the radio'receiving set 27 (see Fig. 1),the same connection, in e'ect, with the radio receiving set 27 beingillustrated in the diagram in Fig. 6, in that the two groups of wires Band C are shown connected tothe same binding post on the receiving set.It is also noted that the wires 31, 32, and 33,0f the group C areinterconnected at their ends It will y opposite to the ends which areconnected by said short leads 36, 3T, while the wires of the group B areinterconnected at one end only.

There will be found a tendency when atmospheric conditions or strays aresuch as to occasion considerable interference with wireless reception bywhat is termed shock or impact excitation of the circuits of receivinorsets. In the present antenna system the wire 26 and the wire 22, inwhich latter the resistance 3S may be incorporated, is essentially anaperiodic circuit or a. circuit to which the radio receiving set is onlyslightly responsive. However, this aperiodic circuit will act as astatic drain or in other words serve to directly ground or shunt thestatic or strays to an extent where the shock e);- citation effectcommunicated by them while noticeable in the radio receiving setconnected thereto by wire 26, is nevertheless considerably attenuated.rI`he second component which comprises the two groups of wires B and Cis also coupled to the receiving set and has a connection by wire 39 tothe first component. The second antenna component is or may be assumedto be tuned to the oscillation frequency of the carrier waveltransmitted, and while also receiving strays at the same time as thefirst antenna component will nevertheless be responsive to a greaterdegree to the modulated carrier waves to which the set is being tuned,than the strays. The capacity effect of the two groups of wire B and Calluded to above also assists in bypassing to some degree staticinterference, and appreciably lessens the disturbance therefrom duringradio reception.

The present system I find in practice to actually attenuate to aconsiderable degree the effect of strays by the means described andillustrated. I am aware of so-called static elimin ators which employfor that purpose comparatively ecomplicated filter systems employinginductance and capacity units which are intercoupled in the receivingapparatus in an endeavor to balance out the so-called strays or static.interference, but I have found the comparatively simple means hereinshown to yield results comparable to those of the far more complicatedmethods employed at a fraction of their cost. It must be recognized thatat best the so-called elimination of static interference is onlyrelative and no system yet devised has succeeded in completelyeliminating static interference without also completely eliminating thesignal desired to be received. As a means for reducing and lessening theeffect of static and strays, the method and means above described andshown will be found of assistance.

While I have herein described with some degree of particularity apreferred form of the invention. it will be understood that somemodification and change may be made in the details as set forth Withoutdeparting from the spirit of or sacrificing any of the advantages of theinvention as defined in the appended claims.

IVhat I claim as new and desire to secure by Letters Patent is:

l. Means for reducing static interference comprising a plurality ofwires fastened to a pair of supporting elements arranged in spacedrelation, one of said plurality of wires being directly connected to aradio receiving set and constituting an aperiodic circuit, the others ofsaid plurality of wires being divided into two groups, each of the wiresof said two groups being arranged in alternate relation to provide acondenser, said condenser being -joined to said aperiodic antennacircuit, and to said radio receiving set.

2. Means for reducing static interference, comprisinfr a plurality ofwires arranged in spaced relation, one of said wires being directlyconnected at one end to a radio receiving set and grounded at the otherend through a resistance, the remainder of said wires being divided intotwo groups, the wires of one group being arranged in alternate relationwith the wires of the other group to provide a condenser, and the wiresforming aid condenser being connected to said radio receiving set.

3. Means for reducing static interference, comprising a plurality ofwires arranged substantially parallel and in spaced relation, one

of said wires being connected at one end to t a radio receiving set andgrounded at the opposite end, the remainder of said wires being dividedinto two groups, the wires of one of said groups being arranged inspaced relation to the wires of the other group to provide a condenser,and the wires forming said condenser being connected to said firstmentioned wire.

In testimony whereof I have signed my name to this specification.

THOMAS R. BAKER.

